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From: jujosei@googlemail.com
Newsgroups: comp.lang.ada
Subject: Problem using Ada.Text_IO.Modular_IO
Date: Wed, 9 Jul 2008 09:52:29 -0700 (PDT)
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Date: 2008-07-09T09:52:29-07:00
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Dear All,

I'm tying to print variables of a defined modular type to the standard
io and a file.
The type I'm working with is: type Unsigned is mod 2**64;

Therefore I define a modular_io package to do this:
package mio is new ada.text_io.modular_io(usigned);

However, when compile my little test program (using gnatmake -gnato),
the compiler tells me that a "Constraint Error" will be raised at
runtime. So I tried it with only 63 bit (mod 2**63), which works fine
with the GNAT 4.3.1 (20080420) on a 32bit Ubuntu-Linux machine.

----------- test program -----------
with ada.text_io; use ada.text_io;
procedure test is
	type Unsigned is mod 2**64;
	package M_IO is new Ada.Text_IO.Modular_IO (Unsigned);
	u : Unsigned := -1;
begin
	m_io.put(Item =>  u, Width =>  20, Base  => 16);
end;
-----------------------------------------

I guess that this is a bug. However, what can I do instead of this, to
get 64 bit words printed as hex, octal and binary?

Thanks in advance!
Cheers
Julian Seifert